import com.rabbitmq.client.*;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

public class ReceiveMessage {
    private static final String QUEUE = "hello";

    public static void main(String[] args) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
//设置MabbitMQ所在服务器的ip和端口
        factory.setHost("47.105.34.67");
        factory.setPort(5672);
        factory.setUsername("guest");
        factory.setPassword("guest");
        factory.setVirtualHost("/");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();
//声明队列
        channel.queueDeclare(QUEUE, false, false, false, null);
        System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
//定义消费方法
        DefaultConsumer consumer = new DefaultConsumer(channel) {
            /**
             * 消费者接收消息调用此方法
             * @param consumerTag 消费者的标签，在channel.basicConsume()去指定
             * @param envelope 消息包的内容，可从中获取消息id，消息routingkey，交换机，消息和重传标志
            (收到消息失败后是否需要重新发送)
             * @param properties
             * @param body
             * @throws IOException
             */
            @Override
            public void handleDelivery(String consumerTag,
                                       Envelope envelope,
                                       AMQP.BasicProperties properties,
                                       byte[] body)
                    throws IOException {
//交换机
                String exchange = envelope.getExchange();
//路由key
                String routingKey = envelope.getRoutingKey();
//消息id
                long deliveryTag = envelope.getDeliveryTag();
//消息内容
                String msg = null;

                try {
                    msg = new String(body, "UTF-8");

                } catch (Exception e) {

                    System.out.println("转换异常");
                }
                System.out.println("receive message.." + msg);
            }
        };
/**
 * 监听队列String queue, boolean autoAck,Consumer callback
 * 参数明细
 * 1、队列名称
 * 2、是否自动回复，设置为true为表示消息接收到自动向mq回复接收到了，mq接收到回复会删除消息，设置
 为false则需要手动回复
 * 3、消费消息的方法，消费者接收到消息后调用此方法
 */
        channel.basicConsume(QUEUE, true, consumer);
    }

}
